From: Pekka Enberg <[email protected]>
We need to setup and restore IRQ registers in __do_IRQ so that get_irq_regs
works correctly. Fixes Alt-Sysrq-p for UML.
Cc: Jeff Dike <[email protected]>
Cc: Paolo "Blaisorblade" Giarrusso <[email protected]>
Signed-Off-By: David Howells <[email protected]>
Signed-off-by: Pekka Enberg <[email protected]>
---
arch/um/kernel/irq.c | 12 ++++++++----
1 file changed, 8 insertions(+), 4 deletions(-)
Index: 2.6/arch/um/kernel/irq.c
===================================================================
--- 2.6.orig/arch/um/kernel/irq.c
+++ 2.6/arch/um/kernel/irq.c
@@ -355,10 +355,14 @@ void forward_interrupts(int pid)
*/
unsigned int do_IRQ(int irq, union uml_pt_regs *regs)
{
- irq_enter();
- __do_IRQ(irq);
- irq_exit();
- return 1;
+ struct pt_regs *old_regs;
+
+ old_regs = set_irq_regs((struct pt_regs *) regs);
+ irq_enter();
+ __do_IRQ(irq);
+ irq_exit();
+ set_irq_regs(old_regs);
+ return 1;
}
int um_request_irq(unsigned int irq, int fd, int type,
-
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